Ive got a 1988 iroc-z that was a 305 stick, that a past owner had put a 350 in it. It has a whine when you put the clutch in mainly in first gear. It whines when you release it slowly. Could this be that it need a new performace clutch or do i need a new trans to accomadate the 350? Im going to put a 383 in it, Is that too much for that trans?

 

first you need to find out wheither you have the stock t5 or the better t56 5 speed?the t5 will hold up to a 350 if you dont drive it to hard all the time,but the t56 is a lot more foregiving when it comes to running hard down the road.IMOP if you upgrade to a 383 plan on upgradeing to the t56 as well but thats just my 2 cents.

 

T-56 is a 6 speed, not a 5 speed - so he DOES NOT have a T-56.

T5 will hold for awhile with a 350 if it's babied. T5 will NOT hold up to a 383 for very long.

You would need to get a T-56 to hold up - it's the 6 speed from a 4th gen. You'll also need new crossmember and some other goodies to put it in your 3rd gen.

 

is it whineing when your sitting at a stop light or sumthing with your foot on the clutch and the car in gear and makes noise untill the clutch is fully ingaged. if so it could just be a pilot bushing.

 

T-56 is a 6 speed, not a 5 speed
sorry that was my bad meant to say the world class t5,was talking to buddy about his t56 swap and got them mixed.ill be the first one to say it lol.

 

Why wont the t-5 trans hold up? Even if i put a performance clutch in it and put some Royal Purple syncromesh in it it still wont hold up to blown mustangs away on a daily basis? What technically will go wrong with the t-5?

 

It whines when i let go slowly off the clutch.

 

 

It wont hold because its a weak transmission, there is a reason GM never put 350's and T5's together. The clutch and "Royal Purple Syncormesh" wont make a difference.

 

If you drive reasonably as camaronewbie suggests, the T-5 should last behind a 350 (mine has). In race applications, however, sooner or later say adios.

JamesC